Quantitative Analysis of SARS-CoV-2 Viral Load in the Lungs of COVID-19 Deceased Patients
https://doi.org/10.21292/2075-1230-2021-99-11-7-15
Abstract
The objective: to perform quantitative analysis of SARS-CoV-2 viral load (VL) levels in lung tissues in deceased patients with COVID-19 and to evaluate its association with the nature of histological changes in the lungs and the duration of stay in ICU till the lethal outcome.
Subjects and Methods. Sections of formalin-fixed and paraffin-embedded lung tissues of 36 deceased patients with COVID-19 were used. The SARS-CoV-2 viral load was quantitatively assessed using the original qPCR. VL was calculated using the following formula: copies SARS-CoV-2 / copies ABL1 × 100, expressed as the ratio of the true number of SARS-CoV-2 cDNA copies per 100 copies of ABL1 gene cDNA.
Results. In cases with no histological changes typical of diffuse alveolar lung injury (DAI), the detection rate of SARS-CoV-2 RNA and the average level of the SARS-CoV-2 viral load were 62.5% (5 out of 8 observations) and 104.75 (range 0-313) copies of SARS-CoV-2 cDNA per 100 copies of human ABL1 gene cDNA. The average level of the SARS-CoV-2 viral load in the lungs with prevailing histological changes characteristic of the proliferative and exudative phases of DAI differed by 60 times and amounted to 909 (18-2,657) and 54,924 (834-250,281) copies of SARS-CoV-2 cDNA per 100 copies of human ABL1 cDNA, respectively. The average duration of stay in the intensive care unit in the group of patients with exudative and proliferative phases of DAI was 10.64 (1-22) and 8.14 (1-21) bed-days, respectively. The detection rate of the SARS-CoV-2 RNA in patients with diffuse alveolar lung injury was 100%.
About the Authors
A. A. Odilov
RUDN University
Russian Federation
Russian Federation
Akmalzhon A. Odilov – Resident Physician of Pathological Anatomy Department of Medical Institute.
6, Miklukho-Maklaya St., Moscow, 117198.
A. A. Volkov
RUDN University;
E. O. Mukhina City Clinical Hospital
Russian Federation
Russian Federation
Aleksey V. Volkov – Doctor of Medical Sciences, Associate Professor of Pathological Anatomy Department of Medical Institute.
6, Miklukho-Maklaya St., Moscow, 117198.
A. O. Аbdullaev
National Research Center of Hematology
Russian Federation
Russian Federation
Adkhamzhon O. Аbdullaev – Candidate of Medical Sciences, Senior Researcher of Molecular Hematology Laboratory.
4, Novy Zykovskiy Drive, Moscow, 125167
A. B. Sudarikov
National Research Center of Hematology
Russian Federation
Russian Federation
Andrey B. Sudarikov – Doctor of Biological Sciences, Head of Molecular Hematology Laboratory.
4, Novy Zykovskiy Drive, Moscow, 125167.
I. I. Babichenko
RUDN University
Russian Federation
Russian Federation
Igor I. Babichenko – Doctor of Medical Sciences, Professor, Head of Pathological Anatomy Department of Medical Institute.
6, Miklukho-Maklaya St., Moscow, 117198.
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Review
For citations:
Odilov A.A., Volkov A.A., Аbdullaev A.O., Sudarikov A.B., Babichenko I.I. Quantitative Analysis of SARS-CoV-2 Viral Load in the Lungs of COVID-19 Deceased Patients. Tuberculosis and Lung Diseases. 2021;99(11):7-15. (In Russ.) https://doi.org/10.21292/2075-1230-2021-99-11-7-15
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